CT 533 Kelly Ball Flashcards
How heavy is apparatus for normal concrete?
30 +-0.1 lb.
Diameter of hemisphere on apparatus?
6 in”
Measures to the nearest what on apparatus shaft?
1/4”
How heavy is apparatus for lightweight concrete?
20+-0.1 lb.
How to calibrate apparatus?
Placing the ball and the feet on a plane surface, turn threaded shaft to obtain zero reading at the top of the sleeve, tighten lock nut.
Depth of concrete under ball should be what for 1 in. or smaller Max agg size?
6”
Depth of concrete under ball should be what for 1 in. or larger Max agg size?
8”
What must be done to the surface before testing?
Struck off level
How large of an area to be tested in ft^2
3 ft^2
Do you tamp, vibrate, or consolidate concrete before test?
No
Read the penetration to the nearest?
1/4”
Penetration of the feet of more than what indicates overworked concrete?
1/8”
How many reading are required and then averaged?
3
Individual readings shall be at least how far between centers?
9”
Minimum distance from the centerline of the handle to the nearest edge of the surface should be?
6”
All 3 readings should be within how much of penetration?
1/2”
Report to the nearest what?
1/4”
What condition should be ball be in?
The ball should not have any scratches, dents, or adhering mortar.
What should be done after each test?
Cleaned carefully and kept in carry case.
